Sparta (EN) - Hartung Helmets

Hartung Helmets
Idea, Research & Development, Production
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Hartung  SPARTA  NATURE        PLUG-IN-HYBRID        4x2 / 4x4                              

Monocoque in high grade stainless, on request aluminium or titanium
Front tubular frame connected to rear tubular frame by basis tubes at the bottom and rollover bars at top

Part time RWD with ~500 HP, fully sufficient to reach 300 km/h in ~15 sec. by high torque V8 BioTurbodiesel SCR AdBlue* (also for urban traffic) + electric drive
"Probably the most powerful car in the world", see press articles under Google :  IAA 2005 and 2009, TopMarquesMonaco 2008 and 2010, Goodwood 2010
Part time electric FWD with energy recuperation for urban traffic and offroad; on request electric RWD, replacing the V8 engine, and Micro Turbine Range Extender MTRE for only electric drive, depending on turbine selection also lossless direct RWD possible from about 100 km/h to 300 km/h
Adjustable economy level** <5 l/100 km, possible range up to 4000 km
With syn- or biofuel (e.g. vegetable- or algae-oil) CO2 neutral, no fire risk e.g. with soya oil; on request from 2024 V8 hydrogen version
Since 1973 first inline 3seater with central driver position in a safety cell with 4 rollover bars
Mid-engine touring- and offroad- “AllTracks” supercar with air suspension, spacious long-term Gran Turismo, a “capital good”
ASC*** see below, on request Active Suspension & Damper Control ASDC*** until "Skyhook"

Body, Weight

Supercars were built to achieve better road holding with a lower center of gravity and larger track widths, therefore flatter and often about 2 m wide, on the other hand the most sporty design with mid-engine practically does not allow 2 rows of seats. So since the beginning of our development 1973 we planned 3 comfortable seats in a spacious interior with 2 strong tilting up armrests (for perfect lateral support while cornering) for easy driver access to the middle of a bench (even possible to lay down), adjustable pedals, 4-point safety belts (on request 6-point-, airbags), and comfortable air suspension for touring and offroad, and a large boot.
Targa-like with oversized rollover cage :  2 pneumatically opening gull wings, easy to remove and to store at the rear, like a sunroof (on request).
Curb weight up from 1500 kg, + 500 kg payload

Engine Data, Engine Architecture

Complete light alloy V8 32 valves transverse mid-engine (~300 kg) behind the safety cell, with California emission standards approval*, BioTurbodiesel with one external intercooler and large electric fan on each rear side, dry sump lubrication
From 6,6 l  ~500 HP / ~1450 Nm with standard consumption in mix ~8 l/100 km, on request adjustable economy-level** <5 l/100 km (possible engine life 500.000 km), up to on request 1000 HP / >2000 Nm with 100.000 miles warranty (expensive), or >2000 HP for racing (without warranty)
CO2-neutral by syn- or biofuel (e.g. soya-, jatropha-, karanja-, camelina-, algae oil), (J)B100, continuous temperature control from the fuel tanks to the engine for winter operation; on request from 2024 V8 hydrogen version
In the front water cooler with 2 large electric fans, emergency wheel, LiFePO4 batteries
(if available in future, on request fireproof and lighter batteries (towards 0,5 kWh / kg battery weight) for only electric drive and MTRE, see above), air compressor and -tank;
on request compressor with A/C, engine-independent heating system, vacuum pump, etc.
On request Micro Turbine Range Extender (MTRE) for battery charging, and for maybe
direct RWD from ~100 km/h (see above), where we continuously trace the development of especially hi-temp ceramic recup gasturbines in terms of efficiency ~40 % and weight, as well as new rotary piston engine technology e.g. by Astron Aerospace.

Power Transmission either 4x2 or 4x4 (see above), for RWD :

6-speed-AMT transverse transaxle right of / behind the V8 engine with gear spread of 8,5 and steering wheel- or joystick-gearshift by PLC (clutch actuation only for starting); on request fully automatic 2-speed Dual Clutch & (dual) Torque Converter Transmission or 4-speed DCTCT with 1st gear low for offroad, 4th gear OD for lower consumption on (see below, especially German) highways
Limited slip differential (LSD), on request 100 % lockable

Chassis, Body, Suspension, Steering, Brakes, Wheels

Oversized dimensioned monocoque safety cell bent from a ~3200 x ~2100 x 2 mm high-grade-stainless-steel- or on request 5 mm aluminum- or 2,5 mm titanium-sheet, welded to high side box framework (flank protection); oversized dimensioned tubular framework in the front and in the back interconnected by basis tubes at the bottom and 4 chrome molybdenum steel (FIA), stainless or titanium rollover bars at top (2 lengthwise in a trapeze from the front bottom to the rear bottom, 2 crosswise)
In the 80s, because of various in practice successfully concluded framework studies, we as composite experts decided to combine the advantages of a tubular framework with those of a economically repairable metallic (and not extremely expensive composite-) monocoque, and to develop a polyvalent vehicle concept combining by height-adjustable air suspension supercar driving characteristics with those of a touring- and offroad-car. The aerodynamically optimized front body for more downforce, like the rear body with a “van” shape boot hood and spoiler, are laminated out of superlight Zylon/Carbon visible fabric composite.
Front axle: pushed double triangular longitudinal links*** (similar to Saab 92), or double triangular wishbones***
Rear axle :  trailed triangular longitudinal links***
Front and rear axle :  without camber adjustment***, with air suspension units adjustable in height by Active Suspension Control ASC*** for slight cornering similar to motorcycles to achieve tire-ideal camber angle*** of all 4 wheels; on request counteraction during acceleration and braking, spring rate and damping adjustable up to Active Suspension & Damper Control ASDC***, until "Skyhook” with analysis of the road in front of the vehicle
On request hydraulic steering, adjustable safety steering wheel
380 mm disc brakes with 8-piston aluminum calipers (total hydraulic area ~400 cm²), cast discs for wet (off-) road; on request strap-drive-discs, carbon-ceramic discs, ABS or adjustable master cylinder balance, inline servo, hand-brake calipers with electric actuator; 'perhaps the most powerful braking system'
Front axle e.g. BFGoodrich g-Force Comp-2 A/S (all season) 235/50 ZR 18, rear axle e.g. g-Force Rival S 335/30 ZR 18, on perdurable steel rims especially for offroad use, or on request on our unique axial fan aluminum or titanium rims with up to >1 m3/sec. per rim of cooling air for the brakes, and for progressive negative pressure below the vehicle (additional downforce), e.g. front 7,5", rear 12"


Wheelbase >=2650, front track ~1850, rear track ~1750, adjustable ground clearance ~150 to ~300 mm :  height from ~1250, length ~4000, width ~2100 mm
On request double-walled tank of ~100 l in each side-box framework (total ~200 l), on request fuel safety bladders; on request from 2024 hydrogen tanks;  boots in passenger area and in the back total ~500 l

Road Performance

Speed limit 300 km/h by offroad-/all season tire compromise (see above), acceleration 0-300 km/h ~15 sec., wheelie bars; lower performance data possible depending on electric motor respectively turbine selection, which will not be recognizable on the outside of the vehicle.
Since top speed was already limited almost everywhere in the world in 1973, the objective of our vehicle development has always been to achieve (based on reliable US engines, on request tuned) best acceleration values in hypercar level by using high-torque turbodiesel engines :  The ratio of torque (~1450 Nm + electric drive) to curb weight (~1500 kg, RTW ~1:1) is almost higher than of extremely more expensive hypercars with top speeds of nowadays until 500 km/h.
The joy of driving shouldn’t be achieved by high speed but by AllTracks agility & safety

Exclusive Overall Concept of chassis and axle design, body, and drive technology

Weight reduction through monocoque / trapezoid tubular framework construction (only possible by central driver's seat position) despite oversizing even for tough offroad use, low center of gravity; largely stainless robust long-term capital good, easy to maintain and to repair; on customer request handmade under rigorous control during about 10.000 hours of highly qualified craftsmanship 'like in old times'
Optimized downforce by body modifications (aerodynamics) and axial fan rims (see above) Incomparable road holding and driving comfort by cornering similar to motorcycles for tire-ideal camber angle (ASC***)
Transverse engine with high masses 'turns' the vehicle slightly forwards when accelerating and backwards when braking, i.e. avoids a possible negative effect during extreme cornering.
On request for the first time DCT with all advantages of torque converters (DCTCT) :
comfortable seamless gear shifting until shifting with torque shock for higher acceleration values than possible with DCT - but without increased clutch wear !
LED “Crab Eyes” in the roof : daylight & highbeam for ~1 km; LED lowbeam, foglight and flashing light at bumper level
Complete instrumentation, on request also by displays
On request cool box, ElectronicStabilityProgram, DampTronic Sky*** shock absorbers, etc.
Spacious AllTracks Gran Turismo, on request measure-made according to passenger sizes, with a 500 l boot and air suspension programmable by PLC (on request damping***, too) for highway, country road, adjustable in height to all terrain characteristics 'à la Paris-Dakar', comfortable (for the spine), reliable and inexpensive also for a daily short haul (e.g. to go to work, for shopping)
The responsible 'purist' of such an extraordinary vehicle enjoys his liberty and highest primary (through best road holding, best brakes, best acceleration) and secondary safety (safety cell; depending on syn- or biofuel lowest until no fire risk), and likes to be overtaken ‘relaxed’.

Base price from € 300.000.-- net, special versions and extras on request by personal advice

After Dieselgate beginning September 2015 and more and more experiences with 'pure' electric vehicles, ships and aeroplanes, the advantages and disadvantages could become more and more obvious in practical comparison to the situation before.
Now we suddenly remember what all well-informed experts in science, R&D and especially (petro)chemistry have known for decades and should have introduced long ago to protect the environment in all areas of traffic :  syn- and biofuel from plants that are not grown in competition with food and for which there is no prior deforestation.
Due to the new Federal Government in Germany, it can be assumed that no general speed limit will be introduced on highways in a foreseeable future. A driver accustomed to speeds of only a little bit more than 150 km/h will never be able to achieve a proximate travel time with a battery-powered electric vehicle on longer distances compared to the Sparta Nature neither in Germany nor probably in other (European) countries.
Apart from that, curiosity by discovering suddenly in the rearview mirror “crab eye lights” (see above) and something unknown very wide & flat below, from experience, practically always motivates other drivers to change to the right lane at once.

As described above, various technologies are still in development phases.
In the meantime, we could also equip the Sparta Nature with a new, used or reconditioned engine-transmission-differential unit from another FWD car, and convert it later on.
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